Oil pump



K. P. NEILSEN OL PUMP Filed OGL 8 1925 Nov. 23 1926.

Patented Nov. 23, 1926.

UNITED STATES KARL P. NEILSEN, OF LONG BEACH, CALIFORNIA.

OIL PUMP.

Application med octobers, 1925. serial No. 61,33'8.

My invention is particularly*applicable to oil well pumps, and consists in certain novel in'lproven'ients in the pump plunger, plunger valve, and their association l with the sucker rod of the pump.

In present pumps having their plunger valve located above the plunger and their sucker rod connected to the upper end of the valve cage, it has been found that sand, scale etc. are deposited around the valve cage and nut due to the fact that their external diameters are necessarily less than that of the pump plunger, and under the action of the weight of the column of oil above the plunger and during reciprocation of the latter, the sand, scale etc. are forced downwardly between the co-acting surfaces of the plunger and liners, thereby scoring the surfaces, and resultingin the sticking of the plunger.

An object of my invention is to provide means whereby the sand, scale etc., is -prevented from accumulating between the plunger and the liners.

Another' object is to provide a pump assembly which is simple, and in which-a number of threaded j oints, heretofore considered essential are eliminated.

A further object is to provide a lsimple and effective connection between the pump plunger and the sucker rod.

Other objects advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description, and the `appended claims.

In the drawing illustrating my invention Fig. 1 is a'longitudi'nal sectional view of one form of my pump.

Fig. 2 is a longitudinal sectional view of another form of my pump with the standing valve not shown.

Fig. 3 is a sectional view on line 3-3 Fig. 2, with the jacket and liners omitted.

Fig. 4 is a sectional view on line lr-4 Fig. 3.

Referring more' particularly to the drawing, my pump includes a tubular plunger 1 which is reciprocally mounted in a jacket 2 in which liners 3 are placed to provide a wearing surface for the plunger.

The plunger 1 is a running fit in the liners 3 and the upper end thereof is chamfered as at 4, to form a sharp upper edge which skims the sand etc. from the walls of the liners, throwing the sand inwardly and is fed to the wearing surfaces of said plunger and liners, during reciprocation of the plunger.

For the larger plunger diameters about 2 inch i. d. more or less, I may extend the sucker rod there-through, and provide a connection at the bottom ofl the plunger, although I may also connect the sucker rod to the top of the plunger as will be described. A sleeve 6 is provided with threads 7 on which the lower threaded end of the plunger 1 is secured. An extension 8 on the sleeve 6 is formed with an internally threaded box 9 into which the usual pin of the sucker rod 10 is screwed. Elongated ports 11 in the extension 8 permits passage of oil from the sleeve 6 to the inside of the plunger 1.

A secondsleeve 12 screws into" the lower end of the sleeve 6 and a valve seat 13 is clamped between said sleeves. A check ball 14 rest-s on the seat 13 and a pin 15 retains said ball in position A standing valve 16 of any well known construction is positioned in the bottom collar 17.

For smaller pump sizes in which the passage through the plunger would be very materially obstructed, I prefer to connect the sucker rod to the upper end of said plunger. If desired the following construction may also be applied to large pump sizes.

A sucker rod connector 18 is threaded at the lower end 19 thereof, and screws into the upper end of the plunger 1. A lock nut 20 screws into the upper end of the plunger 1, and the connector 18 is seated thereagainst, thus prevent-ing said connector from unscrewing. A central opening 21 is provided through the nut 20, to permit passage of oil therethrough.

The connector 18 is counter bored as at 22 from the lower end thereof, and elongated ports 23,V extend thru the wall of the connector into said counter bore to permit the passage ,of oil therethrough into the acket 2 and flow pipe, from the plunger 1. A box 24 is provided at the upper end of the conrthe faces of which bear against the liner 3,

to guide andprevent wobbling of the sucker rod 26. Flat faces 28 arel provided on the v guide 27, which 'serve as a wrench hold, and permit the passage of oil.

A sleeve 29 is threaded into the lowerend of the plunger 1 and a valve seat 30 is clamped between said sleeve and plunger. A ball check 31 is seated on the valve seat 30. The usual standing valve 16 is positioned below the sleeve 29 as shown Fig. 1.

My pump construction is of particular ad vantage when used in connection with a cup stand, in which the cups are below the plunger, in that all sand, grit etc. are kept away from the cups thereby materially lengthening their usefulness.

The' construction hereinbefore described is obviously applicable to different types of.

connector, lock means' in said plunger for said connector, and valve means depending from said plunger.

2. In an oil pump a `tubular plunger, a

said connector, and valve means depending from said plunger, and a scraping edge on the upper end of said plunger.

sucker rod connector screwed into the upper end of said plunger, said connector having connector having a passage therethru for the -ree passage of oil, a box on said connector adapted to receive the sucker rod, a guide on said connector, and valve`1neans depending from sa1d plunger.

5. In'anoil 'pump a tubular plunger, a

sucker rod connector screwed into the upper end of said plunger, a lock nut screwed into said plunger against said connector, said connector having a passage therethru for the. free passage of oil, a box on said connector KARL P. NEILsEN.

3Q In an oil pump, a tubular plunger, a

adapted to receive the sucker -rod, a guide 

